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| DC 欄位 | 值 | 語言 |
|---|---|---|
| dc.contributor.advisor | 楊馥菱 | zh_TW |
| dc.contributor.advisor | Fu-Ling Yang | en |
| dc.contributor.author | 易建宏 | zh_TW |
| dc.contributor.author | Chien-Hung Yi | en |
| dc.date.accessioned | 2023-09-22T17:49:36Z | - |
| dc.date.available | 2023-11-09 | - |
| dc.date.copyright | 2023-09-22 | - |
| dc.date.issued | 2023 | - |
| dc.date.submitted | 2023-08-13 | - |
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| dc.identifier.uri | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/90199 | - |
| dc.description.abstract | 本論文自行搭建位移平台，使用線性滑軌驅動裝有固定重量聚甲醛乾顆粒的圓管，使顆粒依控制速度運動，並在平台下方裝設有高速攝影機，同時觀察容器移動時之底部顆粒的運動狀態。透過霍夫轉換與粒子追蹤法處理運動過程中之照片得出顆粒與標記之空間狀態。此外我們應用四元數與共軛梯度法開發一新轉動演算法，結合顆粒與標記之空間資訊，可算出當下顆粒轉動速度。針對此新開發演算法，我們使用MATLAB軟體進行轉動模擬，考慮不同情境下之空間誤差，也比較不同演算法參數與起始值之誤差影響。為探討顆粒流中的物理量，我們使用空間平均分析，比較不同控制速度下之速度、轉動速度、顆粒溫度等分布。我們發現顆粒轉動比例隨控制速度上升而遞減，且顆粒角速度與顆粒溫度有負相關趨勢。我們亦發現轉動因子與移動速度除以顆粒溫度的根號有冪定律關係，與文獻中的實驗結果相似。 | zh_TW |
| dc.description.abstract | This study constructs a displacement platform that uses a linear stage to drive a circular tube filled with fixed-weight polyoxymethylene particles. The tube moves in a controlled-velocity and a high-speed camera positioned beneath the platform observes the motion of particles at the bottom of the tube. We perform Hough transformation and Particle tracking on the captured images to obtain the spatial information of particles and markers location. In addition, we employ quaternions and conjugate gradient method to develop a new rotational algorithm. Combining rotation algorithm with particles’ and markers’ location, we can calculate the instantaneous particle rotation speed. Through rotation simulations in MATLAB, we evaluate the limitation and usages of the newly developed rotation algorithm in terms of location errors, algorithm parameters and initialization. We use averaging box analysis in the granular flow field to determine the distribution of velocity, rotation velocity, and particle temperature. We find a negative relation between the rotation data percentage and controlled velocity, and a negative relation between the rotation speed and granular temperature. We also find that the dimensionless rotation index has a power-law correlation with the ratio of translational velocity to the square root of granular temperature, which is similar to the experimental result in the literature. | en |
| dc.description.provenance | Submitted by admin ntu (admin@lib.ntu.edu.tw) on 2023-09-22T17:49:36Z No. of bitstreams: 0 | en |
| dc.description.provenance | Made available in DSpace on 2023-09-22T17:49:36Z (GMT). No. of bitstreams: 0 | en |
| dc.description.tableofcontents | 誌謝 I
Abstract II 摘要 III Contents IV List of Figures VII List of Tables XII Nomenclature XIII Chapter 1 Introduction 1 1.1 Granular flow 1 1.1.1 Boundary conditions 1 1.1.2 Flow configuration 5 1.2 Rotation and quaternion 6 1.2.1 Introduction to quaternions 6 1.2.2 Spatial rotation 8 1.2.3 Quaternion rotation formula 9 1.2.4 Spatial rotation in matrix form 11 Chapter 2 Experiment equipment 14 2.1 Experiment setup 14 2.1.1 Granular material 14 2.1.2 Experiment apparatus 15 2.2 Experiment procedure 18 Chapter 3 Image processing 19 3.1 Image preliminary manipulation 19 3.2 Circular Hough transformation 20 3.3 Determination of marker location 21 3.3.1 Grayscale criteria for marker 22 3.3.2 Geometric condition for markers 26 3.3.3 Marker center location algorithm 29 3.4 Error evaluation of radius and location 30 3.5 Tube speed and particle dynamics 33 3.5.1 Tube velocity 33 3.5.2 Sphere dynamics 35 3.6 Quaternion-based rotation algorithm 36 3.6.1 Conjugate gradient method 37 3.6.2 Implementation of quaternion algorithm 38 Chapter 4 Rotation algorithm validation 41 4.1 Simulation of rotation 41 4.2 Evaluation of rotation algorithm 43 4.3 Comparison of CG update parameters 50 4.4 Comparison of initializations of iteration 53 4.5 Discussions 57 Chapter 5 Experimental results 59 5.1 Bulk property analysis 59 5.2 Bulk translation 61 5.3 Bulk Rotation 64 5.3.1 Rotation data percentage 64 5.3.2 Rotation velocity 66 5.4 Rotation index 68 5.5 Granular temperature 72 Chapter 6 Conclusions and summary 76 References 78 | - |
| dc.language.iso | en | - |
| dc.subject | 角速度 | zh_TW |
| dc.subject | 四元數 | zh_TW |
| dc.subject | 顆粒流 | zh_TW |
| dc.subject | 顆粒轉動 | zh_TW |
| dc.subject | particle rotation | en |
| dc.subject | granular flow | en |
| dc.subject | quaternion | en |
| dc.subject | rotation speed | en |
| dc.title | 基於四元數之演算法在侷限顆粒流動之粒子旋轉研究 | zh_TW |
| dc.title | Studying Particle Rotation in a Confined Granular Material in Bulk Translation using a Quaternion-based Algorithm | en |
| dc.type | Thesis | - |
| dc.date.schoolyear | 111-2 | - |
| dc.description.degree | 碩士 | - |
| dc.contributor.oralexamcommittee | 林正釧;張鈞棣 | zh_TW |
| dc.contributor.oralexamcommittee | Cheng-Chuan Lin;Chun-Ti Chang | en |
| dc.subject.keyword | 顆粒流,顆粒轉動,四元數,角速度, | zh_TW |
| dc.subject.keyword | granular flow,particle rotation,quaternion,rotation speed, | en |
| dc.relation.page | 83 | - |
| dc.identifier.doi | 10.6342/NTU202303579 | - |
| dc.rights.note | 未授權 | - |
| dc.date.accepted | 2023-08-14 | - |
| dc.contributor.author-college | 工學院 | - |
| dc.contributor.author-dept | 機械工程學系 | - |
| 顯示於系所單位： | 機械工程學系 | |
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